標籤：set span code ack jquer head ext meta lib
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body><input type="text" value="請輸入姓名" id="J_xingming" /> </body><script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script><script type="text/javascript"> $(function(){ $("#J_xingming").focus(function(){//姓名框獲得滑鼠焦點 var txt_value = $(this).val() ;//得到當前文字框的值 if(txt_value==‘請輸入姓名‘){ $(this).val("");//如果符合條件，則清空文字框內容 } }); $("#J_xingming").blur(function(){//姓名框失去滑鼠焦點 var txt_value = $(this).val() ;//得到當前文字框的值 if(txt_value==‘‘){ $(this).val("請輸入姓名");//如果符合條件，則設定內容 } }); });</script></html>
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設定和擷取html、文本和值
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